Formula: AuAg(S,Se)
Origin of name: for Nina Petrosvkaya, Russian mineralogist
Crystal system: monoclinic
Crystal class: 2 or m or 2/m
Twinning:
Unit cell:
Colour: dark gray to black
Diaphaneity: opaque
Luster: dull, metallic
Habit: fine-grained rims, 10 to 20 mm thick
Hardness: 2 to 2.5
Specific gravity: 9.5
Cleavage: none
Tenacity:
Streak: dark gray
Synonyms/varieties:
Comments:
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